Geological Indicators

noun a type of mineral that belongs to the group of crinoids, marine animals related to starfish and sea urchins

• Actinocrinite is a type of mineral that forms in radiating clusters of needle-like crystals.
• I found a cool piece of actinocrinite while hiking in the mountains.
• Check out this funky actinocrinite I scored at the gem show!
• The actinocrinite crystals seemed to glow with an otherworldly energy.

noun a mineral consisting of a hydrous zinc arsenate often containing some cobalt and nickel

• The mineral collection included a rare specimen of adamite.
• I heard that adamite is a valuable mineral to collect.
• Check out this cool adamite I found while hiking!
• Her personality was as vibrant and unique as adamite.

noun a mineral consisting of a hydrous carbonate of manganese and barium

• The mineralogist identified the rare afwillite specimen in the rock sample.
• I heard that afwillite is a very valuable mineral to collectors.
• Yo, check out this sick afwillite crystal I found on my hike!
• Her kindness was like an afwillite gem, rare and precious in a world of rough stones.